Fluid-actuated inlet valve for rock drills



Feb. 26, 1924 11,484,678

' F. M. SLATER FLUID ACTUATED INLET VALVE FOR ROCK DRILLS Filed Dec. 6,1921 2 Sheets-Sheet l INVENTOR HIS ATTORQEY Feb. 26, 1924, 31,484,678

- F. M. SLATER FLUID ACTUATED INLET VALVE FOR ROCK DRILLS Filed Dec. 6,1921 2 Sheets-Sheet 2 INVENTON m cewfMzjlafcfiw HIS ATT NEY PatentedFelt, 26, W24

IF SLATE-' @F TON, PENNSYLVANIA, ASSIGNOR T0 INGOLL-FJAND COM- FATENTFFHEO 19, @F dEY (CITY, NEW JERSEY, A. CORPORATION @F NEW JERSEY- FIL'UlllD-AGTUATED INLET VALVE FOR RUSK DRTLLS.

application filed December 6, 1921.

To all whom it may concern:

Be it kno that l Fran M, Sterne, a citizen of the United tates, and aresident of Easton, county of Northampton, and

0 State of Pennsylvania, have invented a certain Fluid-Actuated llnletValve for lR-ock Drills, of which the following is a speclfication,accompanied by drawings.

This invention relates to fluid actuated i rock drills, hut moreparticularly to a fluid actuated valve controlling only the inletsupply, the exhaust losing controlled by the piston llnlet valves of theusual t pe have heen 1 subject to the following efects: Either the istonhas been long and consisted of two eads and a joining neck, or else ithas heen necessary to throw the valve by compression.

The objects of the invention are to enable the valve to he thrown bylive air and utilize a piston having one head, thus decreasin theover-all ength or" the piston and weight of the machine.

Further objects of the invention will hereinafter appear, and to all ofthese ends the invention is shown in the accompanying drawings, inwhich- Figure l is a diagrammatic view in longitudinal sectionalelevation, of so much of a rock drill as will serve to illustrate theinvention, with the piston at the beginning of its forward stroke,

Figure 2 is a similar view with the piston at the heginnin of itsrearward stroke,

Figures 3 an d are similar views of a modification of the valve.

Referring to the drawings, and at first more particularly to Figures 1and 2, the cylinder A of the rock drill is provided with the piston B,having the head C and forward extension or shank D. The fluid actuatedvalve E, in accordance with this invention, controls the inlet supply Fand free exhaust ports G, of which there may be one or more, in thisinstance two being indicated, are controlled by the piston head C.

The inlet valve E is rovided with the end heads ll and a single centralflange J of larger diameter than the heads H. The central flange Jcontrols the passage of metill Serial lilo. 520,3 l4.

tive fluid from the inlet F to both ends of thed c linder A, through thepassages K an Small ports, in this instance indicated as the ports 0 andP connect the inlet F directly with the spaces Q and lit respectively,at the ends of the valve, and connecting .passages S and T join thespaces Q and lit at each end of the valve with the cylinder at pointsbetween the middle and the ends of the cylinder,

The valve may he mounted in a valve chest, if desired, in any suitablemanner, and in this instance, the ends of the valve chest are shownclosed by the valve chest hushlngs U and V, as a convenientconstruction. The small ports (I) and l? are shown in all the figures,as extending through the valve itself as a preferable construction, andin Figures 1 and 2 they may conveniently'be formed in the central valveflange J. These small ports O and P are cut oil by the operation of thevalve, and alternately connect the inlet F directly with the spaces Qand R at the ends of the valve as a preferable construction.

The valve is thrown by live motive fluid passing to the ends of thevalve, through the small ports 0 and P and building up pressure at oneof said ends of the valve, when the piston closes one of the connectingpassages K or L, the other of said connecting passages being opened toatmosphere through the cylinder. The valve is held by the pressure oflive motive fluid on one face of the central flange J, which as stated,

is of larger diameter than either head of the valve In the operation ofthe device, let it be assumed, that the piston B in Figure 1, is startinon its forward stroke. The valve is in t e position indicated in saidfigure, and live motive fluid passes from the inlet supply F around thevalve, through the supply passage K hehind the piston head G, drivingthe piston forward. The pressure of motive fluid on the face of thecentral flange J holds the valve in the position indicated. Any leakagefrom the inlet, past the rearward head H of the valve, only serves tohold the valve in the desired position. Motive fluid passing through theGil Gil-

lllltl haust G.

As the piston moves forward, and uncovers the exhaust G, the pressureholding the valve in its forward position is reduced to atmosphere bothbehind the central valve in Figure 3, the live motive fluid may passflange and behind the rearward valve head H. The exhaust from theforward end or the cylinder having been closed by the piston in itsforward movement, and the piston having over-run the connecting passa eS, the pressure of the live motive fluid bui din}? up in front of theforward valve head throws the valve rearwardly, opening'the sup ly ofmotive fluid to the forward end of t e cylinder, which starts the pistonrearwardly and at the same time, the pressure on the forward face of thecentral flange J holds the valve in rearward position.

When the valve is in the osition indicated in Figure 1, it will be 0served that the small port P is cut oil from the inlet supply andslmilarly in the position indicated in Figure 2, the small port 0 is cutofi' from the inlet supply, This is. the preferable construction,because if these small orts O' and P were continuously open to t e inletsupply, there would be a certain amount of waste motive fluid passedthrough the said orts to atmosphere, through the open exiiaust port, andthe motive fluid would not be alternately admitted to either end of thevalve, although the valve would operate in substantially the samemanner.

In the modification shown in Figures 3 and 4 the valve is provided withthe small ports 0' and P convenientl located at an angle in the body ofthe va vs at the base of the central flange J instead of extending fromthe circumference of the flange-to the body of the valve, as in Figures1 and 2. Otherwise the construction of the modification is like thatindicated in the other figures and the operation of the device issimilar. When the valve is in the position indicated freely through thesmall port 0' to at mos here through the open exhaust, but the sma 1port P is cut off and motive fluid does not pass through said port owingto'the fact that" the connecting assage T is closed by the pistonhead C.imilarly in Figure 4, the small port P is openfor. the passa ofmotive-fluid and the other small port is out of, so that as in Figures 1and 2, motive fluid is alternately admitted throu h said small ports toopposite ends of t e valve, for throwing sa d valve in oppositedirections.

I claim: I v a 1. In atfluid actuatedrock drill, the combination withthe cylinderand reciprocating piston, of a fluid actuated valvecontrolling the inlet. supply' and having end headsv and the passage 0fluid passin a sin le central flange of larger diameter than t e heads?the central flange controlling to both ends of the cylinder small portsconnecting the inlet directly with the spaces at the ends of the valve,connecting assa es joinin the spaces'at each end of t e va ve with t ecylinder at points between the middle and the ends of the cylinder, anda free exhaust port-controlled b ,the piston, whereby the valve isthrown y the live motive through sai small ports and building uppressure at one of said ends of the valve when the piston closes one ofsaid connection passages, the other of said connectin passages beingopen to atmosphere throng thecylinder, and the valve: being held by thepressure of live motive fluid onone face of the central flange of largerdiameter than the heads of the valve.

' 2. In a fluid actuated rock drill, the commotive fluid from theinletto the ends of the valvea single central flange of larger diameter4 than the. heads, the central flange controlling the passageofmotivefluid from the inlet to both ends of the cylinder, small ports toalternately connect the inlet direc y with the spaces at the ends of thevalve, connect ing passages joining the spaces at each end of t e valvewith the cylinder at points between the middle and the ends of thecylinder, and a free exhaust port controlled by the piston, whereby thevalve is thrown by the live motive fluid passing to the ends of thevalve through said small orts and building up pressure at one of saidends of the valve, when the piston'closesone of said connectingpassages, the other of said connecting passages being open to atmospherethrough the cylinder, and the valve eing held by the pressure of livemotive fluid on one face of the central flange of larger diameter'thanthe heads of the valve.

3. In a fluid actuated rock drill, the combination with the cylin er andreciprocating .piston of a fluid actuated valve controllin the passageofmotive fluid from the inlet to both ends of the cylinder, small portsextending through the valve and connecting the inlet directly with thespaces at the ends of the valve, connecting passages joinin the spacesat each endof the valve with t e cylinder at points. between the middleand the ends of the .c linder, and a free exhaust port controlled y theliiston, whereby the valve is thrown ,by the 've motive, fluid passingto the ends of the valve through said small ports and buildi up pressureatone of said ends of the va ve when the piston closes lid nceaeve oneof said connectiw pamages, the other oi said connecting passa bem heldopen to atmosphere through t e cylin er, and the valve beln held b theressure of live motive flui on one ace of t e central flange or largerdiameter than the heads of the valve.

4. In a fluid actuated rock drill, the combination with the cylinder andreciprocating piston of a fluid actuated valve controllin the inletsupply and having end heads an a sin is central flange of largerdiameter than t e heads, the central flange controlling the passage ofmotive fluid from the inlet to both ends of the cylinder, small portsextending through the valve to alternately connect the inlet directlywith the spaces atthe ends of the valve, connecting joini the spaces ateach end of t e valve with t e cylinder at points between the middle andthe ends of the cylinder, and a tree exhaust port controlled by thepiston, whereby the valve is thrown by the live motive fluid passing tothe ends of the valve through said small ports and building up pressureat one of said ends of the valve when the piston closes one of saidconnecting passages, the other of said connecting passages being own toatmosphere through the cylinder, and the valve being held by thepressure of live motive fluid on one face of the central flange oflarger diameter than the heads of the valve,

5. lln a fluid actuated rock drill, the combination with the cylinderand reciprocating piston of a fluid actuated valve controllin the inletsupply and having end heads an a si le central flange of larger diameterthan t e heads, the central flange controlling the passage of motivefluid from the inlet to both ends of the cylinder, small ports extendingthrough the central flange and connecting the inlet directly with thespaces at the ends of thevalve, connecting passages joinin the spaces ateach end of the valve with t e cylinder at points between the middle andthe ends of the cylinder, and a free exhaust port controlled by thepiston, whereby the valve is thrown by the live motive fluid passing tothe ends of the valve through said small ports and building up pressureat one of said ends of the valve when the piston closes one of saidconnecting passe es, the other of said connecting passages being own toatmosphere through the cylinder. and the valve being held by thepressure of live motive fluid on one face of the central passages flangeof larger diameter than the heads of the valve,

t. In a fluid actuated rock drill, the combination with the cylinder andreciprocating piston of a fluid actuated valve controlling the inletsupply and having end heads an a sin le central flange of largerdiameter than die heads, the central flange controlling the passage ofmotive fluid from the inlet to both ends of the cylinder, small ports,extendin through the central flange, to alternate y connect the inletdirectly with the spaces at the ends of the valve, connecting passagesjoining the spaces at each end of the valve with the c linder at pointsbetween the middle and the ends of the cylinder, and a free exhaust portcontrolled by the piston, whereby the valve is thrown by the live motivefluid passing to the ends of the valve through the said small ports andbuilding up pressure at one of said ends of the valve when the pistoncloses one of said connecting passages, the other of said connectingpassages being open to atmos here through the cylinder, and the valvesing held by the pressure of live motive flui on one face of the centralflange of larger diameter than the heads of the valve.

7 lln a fluid actuated rock drill, the'combination with the cylinder andreciprocating piston of a fluid actuated valve controlling the inletsupply and having end heads and a sin lc central flange of largerdiameter than t e heads, the central flange controlling the passage ofmotive fluid from the inlet to both ends of the cylinder, small portsconnecting the inlet directly with the spaces at the ends of the valve,connecting passages joining the spaces at each end of the valve with thecylinder at points between the middle and comes onding ends of thecylinder, and a free ex aust port controlled by the iston, whereby thevalve is thrown by the ive motive fluid passing to the ends of the valvethrough said small ports and building up pressure at one of said ends ofthe valve when the piston closes one of said connecting passages, theother of said connecting passages being open to atmos here throu h thecylinder, and the valve being held by t e pressure of live motive fluidon one face of the central flange of larger diameter than the heads ofthe valve.

In testimony whereof l have signed this specification.

FRED M. SLATER.

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